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EPA Tightens the Annual PM2.5 Standard, Creating Compliance Challenges Across the West

On February 7, 2024, EPA released its final rule tightening the annual National Ambient Air Quality Standard (“NAAQS”) for fine particulate matter (“PM2.5”), from 12 µg/m3 to 9 µg/m3. EPA’s decision to drop the standard to...more

Impacts on the Western US from EPA Proposed Strengthening of Annual PM2.5 NAAQS

On January 6, 2023, EPA released a pre-publication version of its highly anticipated proposal to strengthen the National Ambient Air Quality Standard (“NAAQS”) for fine particulate matter or PM2.5, one of two classes of...more

EPA Applies More Rigorous Emission Controls on Uintah and Ouray Indian Reservation Lands

EPA is poised to publish a final Federal Implementation Plan (FIP) for emissions from oil and natural gas sources on Indian country lands within the Uintah and Ouray Indian reservation in northeast Utah. EPA recently released...more

Policy Review Heats Up Under New EPA Administrator Regan

The swearing-in of Michael Regan as EPA Administrator means that open questions on policy, agenda-setting, and prioritization for the Agency will soon be answered. Issues that have risen to the top of the new EPA...more

EPA Proposes to Retain Particulate Matter Standards of Importance to Industries in Arid West

On April 14, 2020, the Environmental Protection Agency (EPA) proposed to retain the current National Ambient Air Quality Standards (NAAQS) for particulate matter, including both the PM10 and PM2.5 standards. The PM10 and...more

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